QI (a) A balanced star connected load of (8+ j3) 2 is connected to a 3-phase, 415 V and 50 Hz supply. Draw the circuit diagram, indicating VRN, VRY and all line currents. Calculate: (i) (ii) The 3 line currents (IR, Iy and IB). The total real power (W) and power factor at the 3 phase supply.

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Q1 (a) A balanced star connected load of (8 + j3) N is connected to a 3-phase, 415 V
and 50 Hz supply.
Draw the circuit diagram, indicating VRN, VRY and all line currents.
Calculate:
(i)
(ii)
The 3 line currents (IR, Iy and IB).
The total real power (W) and power factor at the 3 phase
supply.
(b)
An unbalanced delta connected load consisting of the phase impedances ZRY
(10+j3) Q, ZYB (12+j0) N and Zbr (8+j3) N is connected to a 3-phase, 440
V, 50 Hz supply. Draw the circuit diagram including the implementation of
a 2 wattmeter power measurement.
Using the information above:
Calculate the 3 load phase currents (IRY, IYB and IBr).
Draw a scaled phasor diagram indicating all phase and line
voltages and the three load phase currents.
Using the scaled phasor diagram or otherwise determine the 3
line currents (IR, Iy and IB).
(i)
(ii)
(ii)
(c)
Determine the total real supply power (W) for Q1(b) based on the 2
wattmeter measurements.
Transcribed Image Text:Q1 (a) A balanced star connected load of (8 + j3) N is connected to a 3-phase, 415 V and 50 Hz supply. Draw the circuit diagram, indicating VRN, VRY and all line currents. Calculate: (i) (ii) The 3 line currents (IR, Iy and IB). The total real power (W) and power factor at the 3 phase supply. (b) An unbalanced delta connected load consisting of the phase impedances ZRY (10+j3) Q, ZYB (12+j0) N and Zbr (8+j3) N is connected to a 3-phase, 440 V, 50 Hz supply. Draw the circuit diagram including the implementation of a 2 wattmeter power measurement. Using the information above: Calculate the 3 load phase currents (IRY, IYB and IBr). Draw a scaled phasor diagram indicating all phase and line voltages and the three load phase currents. Using the scaled phasor diagram or otherwise determine the 3 line currents (IR, Iy and IB). (i) (ii) (ii) (c) Determine the total real supply power (W) for Q1(b) based on the 2 wattmeter measurements.
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